Hi Soumya,
CA TDM 3.6 does not have the ability to convert VSAM files to DB2 table structures.
TDM is about the management of Test data to facilitate development, not for the migration of data structures.
If you still feel like raising this ability as an enhancement, please open it as an Idea through the Communities page. Community users will be able to view and vote for the idea. Based on the votes, our Product Management Team will review it and look into the feasibility/benefit of adding it to a future release.
If this answers your question, please mark this response as a correct answer.
Thanks,
Sameer